Azure DevOps Test Plans Test retention - What influences setting back test outcome to Active?

Hey there, 

I just wanted to understand, what has an effect on the retention of the outcome of a test run. Get started (MS help) is explaining a setting for that. So, if I set the test retention setting „Days to keep..." to "Never delete" I'm expecting that the test outcome isn't touched after a specific time, right?

Are there any other use cases which leads into setting the test outcome back to active automatically, like changing a requirement which is linked (tested by) to the test case?

thx